docs: def ThreadsWithRunningExecServers(self):
      """Returns a list of tids of inferior threads with open exec servers."""
      socket_dir = '/tmp/pyringe_%s' % self.inferior.pid
      if os.path.isdir(socket_dir):
        return [int(fname[:-9])
                for fname in os.listdir(socket_dir)
                if fname.endswith('.execsock')]
      return []